body, div,dl,dt,dd,ul,li,h2,h3,h4,h5,h6,input,form,a,p,textarea{
	margin: 0;
	padding: 0;
}
 ol ,ul ,li {
 	list-style: none;
 }
 a{
 	text-decoration: none;
    /* color: white; */
 }
input{
	outline: none;
}
 img{
 	border: none;
 }
 .clearfloat{
 	zoom: 1;
 }
 /* 额外标签法，在最后一个盒子（块级元素）中写 clear：both */
 .clearfloat::after{
	 content:" ";

	display:block;

	clear:both;

	height: 0;

	visibility:hidden;

}